z80 bugs

[jscrane]

64K CP/M Vers. 2.2 (Z80 CBIOS V1.2 for Z80SIM, Copyright 1988-2007 by Udo Munk)

A>d:
D>zexdoc
Z80 instruction exerciser
...
ld <bcdexya>,<bcdexya>........  ERROR **** crc expected:478ba36b found:8088c9d9
...

A page which mentions this group of tests. This group of tests also crashes cpmsim:

ld <bcdexya>,<bcdexya>........(  6,912) cycles 
E (37088206) core: Op-code trap at 0x2547 0xdd 0x40
I/O ran for 93890 ms, waited for 0 ms

[jscrane]

This testsuite has a misleading name: the "doc" part of the name refers to the documented processor status flags, not the op-codes.

(zexall tests the other status flags 3 and 5 too.)

[jscrane]

The unimplemented opcodes it's testing are:

unimplemented dd/fd op: 40
unimplemented dd/fd op: 41
unimplemented dd/fd op: 42
unimplemented dd/fd op: 43
unimplemented dd/fd op: 47
unimplemented dd/fd op: 48
unimplemented dd/fd op: 49
unimplemented dd/fd op: 4a
unimplemented dd/fd op: 4b
unimplemented dd/fd op: 4f
unimplemented dd/fd op: 50
unimplemented dd/fd op: 51
unimplemented dd/fd op: 52
unimplemented dd/fd op: 53
unimplemented dd/fd op: 57
unimplemented dd/fd op: 58
unimplemented dd/fd op: 59
unimplemented dd/fd op: 5a
unimplemented dd/fd op: 5b
unimplemented dd/fd op: 5f
unimplemented dd/fd op: 78
unimplemented dd/fd op: 79
unimplemented dd/fd op: 7a
unimplemented dd/fd op: 7b
unimplemented dd/fd op: 7f

[jscrane]

zexall failures:

...
cpd<r>........................  ERROR **** crc expected:134b622d found:41e840fa
cpi<r>........................  ERROR **** crc expected:2da42d19 found:8a8e94ca
...
ld <bcdexya>,<bcdexya>........  ERROR **** crc expected:478ba36b found:8088c9d9

The difference between zexall and zexdoc is that the former tests the undocumented flags, 3 and 5.

[jscrane]

It would be very useful to implement a skeletal Linux CP/M to run these tests quickly while fixing these bugs.

[jscrane]

It would be very useful to implement a skeletal Linux CP/M to run these tests quickly while fixing these bugs.

This is done.

Also fixed remaining fuse test failures and zexall failures above.